Thomas rattenbtjry



l @uiten ttttr gettin @fitteE Letters Patent No. 74,846,v dated February 25, 1868. v

IMPROVBD SELF-scrute BOLT.

@te Stimuli referrer tur-iu tlgtst tetttrs Went-mrt mating part nt itesm.

To WHQM IT MAY eoNcEnNe Be it' known thatI,A THOMAS RATTENBURY, of the eity of Detroit, iu the county of Wayne, in the State of Michigan, have invented a new Self-Acting Bolt for double doors of every description and I do declare that the following issu-accurate description' thereof, reference being had to theaooompanying drawings, and to the letters of reference marked thereon, and being a. part of this specification. i

Figure 1 is a. front view of the holt. Y Y

Figure 2 is a. rear view of the bolt, showing the bolt and spring inside the case.

The same letters represent similar parte of, the bolt `upon euch figure. l i i v The ntture of my invention consists in using the case A, provided with the slot E, with the'bolt B, and the thumbpiece C. Upon the end of the pin F, (which forms ,a part. of the bolt 13,) I place the'spirall spring D; whichiorces the bolt hack Vinto the frame A when thedoorsl'are open. I make thesebolts either rightor lefthanded, andapply them to double doors, upon the left-hand door at the top and bottom, in such almanl'ner that, when theright-hand door is closed, the inner side of the door strikes the thumb-piece C, and forces the bolty B into the hpproprite holt-sockets; cut vinto the top and bottoml of the door-frame. When the door strikes the thumb-pieceyit revolves the b'olt by the thumb-piece'traversing the slotE. Y I

The bolt is .automatic in its operation, requiring nothingbut the'closing ofthe doors to fasten the left-hand door, tvhen, hy turning the key in the right-hand door, both are fastened. Y

What I claim as my invention, end desire to secure by Letters Patent, i'sn 1. The projection or thumb-piece C, working in the slot E, by which the closing of the second door compels the holt B to act. 2 y

2. The combinationof, the above-described partswith the frame'A, the-spring D, and the stem F, when constructed to act automatically, substantially as described v THOMAS RATTENBURY.

Witnessesf.

H. S. SPRAGUE, JEROME Ensems. 

